What is Database Architecture

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Database  Architecture  Database store a lot of critical information to access data quickly and security we need to select the correct architecture for efficient data for management client for the machine is the database architecture client  . Database management system architecture help user to get their into a request done file connecting with database . We choose the database architecture based on the following factures  1.Size of the database                                                                            2.Number of users                                                                      ...
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What is Java Virtual Machine and Command Line Arguments

                                              Java Virtual Machine



All language compiler translate source code into machine code for a specific computer .Java compiler also does the same thing ,Then how does java archive architecture neutrality ? The answer  is that the java compiler produces an intermedia code known an bytecode for a machine that does not exits , This   is  a machine is called the java virtual machine and it exits only inside the computer memory , It is a simulated   computer within the computer and does all major machine of a real computer, illustrates the process of compiling a java program into byte code which is also referred to as virtual machine code 

The virtual ma chine code is not machine specific code (known as machine code) is  generated by the code interpreter by acting as an intermediary between the virtual machine and the real machine as shown in Remember that the interpreter is different for different machines.  

      Bytecode                   Java                          Machine                          Virtual Machine        Interpreter                       Code                                                                                                    Real Machine  

                
 Illustrate hoe java work on a typical computer , The java object framework (Java API) acts as the intermediate between the user the virtual machine which in turn acts the intermediary between the operating system and the java object framework 


         .Command Line Arguments

There may be occasions when we may like our program to acts in a particular way depending on the input provided at the time of in the executions . This is archived in java program by using what are the known as command line argument , command line argument are para meter that are supplied to the application program at the time of invoking it of execution , It may be recalled that program was for  invoked execution of the command line 

.Here, we have not supplied any command line argument. Even if we supply argument, the program does not know what to do with them.
 We can write Java programs that can receive and use the argument provided in the command line. Recall the signature of the main ( ) method used in our earlier example programs: 

As pointed out earlier, is declared as any array of string  known as string objects .Any argument provided in the command line at the time of execution are passed to the array its elements , We can simply access the array element and use them in the program as we wish .  



 

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